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| 1 | /* |
| 2 | * clk-max77686.c - Clock driver for Maxim 77686 |
| 3 | * |
| 4 | * Copyright (C) 2012 Samsung Electornics |
| 5 | * Jonghwa Lee <jonghwa3.lee@samsung.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/platform_device.h> |
| 27 | #include <linux/mfd/max77686.h> |
| 28 | #include <linux/mfd/max77686-private.h> |
| 29 | #include <linux/clk-provider.h> |
| 30 | #include <linux/mutex.h> |
| 31 | #include <linux/clkdev.h> |
| 32 | |
| 33 | enum { |
| 34 | MAX77686_CLK_AP = 0, |
| 35 | MAX77686_CLK_CP, |
| 36 | MAX77686_CLK_PMIC, |
| 37 | MAX77686_CLKS_NUM, |
| 38 | }; |
| 39 | |
| 40 | struct max77686_clk { |
| 41 | struct max77686_dev *iodev; |
| 42 | u32 mask; |
| 43 | struct clk_hw hw; |
| 44 | struct clk_lookup *lookup; |
| 45 | }; |
| 46 | |
| 47 | static struct max77686_clk *to_max77686_clk(struct clk_hw *hw) |
| 48 | { |
| 49 | return container_of(hw, struct max77686_clk, hw); |
| 50 | } |
| 51 | |
| 52 | static int max77686_clk_prepare(struct clk_hw *hw) |
| 53 | { |
| 54 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
| 55 | |
| 56 | return regmap_update_bits(max77686->iodev->regmap, |
| 57 | MAX77686_REG_32KHZ, max77686->mask, |
| 58 | max77686->mask); |
| 59 | } |
| 60 | |
| 61 | static void max77686_clk_unprepare(struct clk_hw *hw) |
| 62 | { |
| 63 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
| 64 | |
| 65 | regmap_update_bits(max77686->iodev->regmap, |
| 66 | MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask); |
| 67 | } |
| 68 | |
| 69 | static int max77686_clk_is_enabled(struct clk_hw *hw) |
| 70 | { |
| 71 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
| 72 | int ret; |
| 73 | u32 val; |
| 74 | |
| 75 | ret = regmap_read(max77686->iodev->regmap, |
| 76 | MAX77686_REG_32KHZ, &val); |
| 77 | |
| 78 | if (ret < 0) |
| 79 | return -EINVAL; |
| 80 | |
| 81 | return val & max77686->mask; |
| 82 | } |
| 83 | |
| 84 | static struct clk_ops max77686_clk_ops = { |
| 85 | .prepare = max77686_clk_prepare, |
| 86 | .unprepare = max77686_clk_unprepare, |
| 87 | .is_enabled = max77686_clk_is_enabled, |
| 88 | }; |
| 89 | |
| 90 | static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = { |
| 91 | [MAX77686_CLK_AP] = { |
| 92 | .name = "32khz_ap", |
| 93 | .ops = &max77686_clk_ops, |
| 94 | .flags = CLK_IS_ROOT, |
| 95 | }, |
| 96 | [MAX77686_CLK_CP] = { |
| 97 | .name = "32khz_cp", |
| 98 | .ops = &max77686_clk_ops, |
| 99 | .flags = CLK_IS_ROOT, |
| 100 | }, |
| 101 | [MAX77686_CLK_PMIC] = { |
| 102 | .name = "32khz_pmic", |
| 103 | .ops = &max77686_clk_ops, |
| 104 | .flags = CLK_IS_ROOT, |
| 105 | }, |
| 106 | }; |
| 107 | |
| 108 | static int max77686_clk_register(struct device *dev, |
| 109 | struct max77686_clk *max77686) |
| 110 | { |
| 111 | struct clk *clk; |
| 112 | struct clk_hw *hw = &max77686->hw; |
| 113 | |
| 114 | clk = clk_register(dev, hw); |
| 115 | |
| 116 | if (IS_ERR(clk)) |
| 117 | return -ENOMEM; |
| 118 | |
| 119 | max77686->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL); |
| 120 | if (!max77686->lookup) |
| 121 | return -ENOMEM; |
| 122 | |
| 123 | max77686->lookup->con_id = hw->init->name; |
| 124 | max77686->lookup->clk = clk; |
| 125 | |
| 126 | clkdev_add(max77686->lookup); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int max77686_clk_probe(struct platform_device *pdev) |
| 132 | { |
| 133 | struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); |
| 134 | struct max77686_clk **max77686_clks; |
| 135 | int i, ret; |
| 136 | |
| 137 | max77686_clks = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk *) |
| 138 | * MAX77686_CLKS_NUM, GFP_KERNEL); |
| 139 | if (!max77686_clks) |
| 140 | return -ENOMEM; |
| 141 | |
| 142 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { |
| 143 | max77686_clks[i] = devm_kzalloc(&pdev->dev, |
| 144 | sizeof(struct max77686_clk), GFP_KERNEL); |
| 145 | if (!max77686_clks[i]) |
| 146 | return -ENOMEM; |
| 147 | } |
| 148 | |
| 149 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { |
| 150 | max77686_clks[i]->iodev = iodev; |
| 151 | max77686_clks[i]->mask = 1 << i; |
| 152 | max77686_clks[i]->hw.init = &max77686_clks_init[i]; |
| 153 | |
| 154 | ret = max77686_clk_register(&pdev->dev, max77686_clks[i]); |
| 155 | if (ret) { |
| 156 | switch (i) { |
| 157 | case MAX77686_CLK_AP: |
| 158 | dev_err(&pdev->dev, "Fail to register CLK_AP\n"); |
| 159 | goto err_clk_ap; |
| 160 | break; |
| 161 | case MAX77686_CLK_CP: |
| 162 | dev_err(&pdev->dev, "Fail to register CLK_CP\n"); |
| 163 | goto err_clk_cp; |
| 164 | break; |
| 165 | case MAX77686_CLK_PMIC: |
| 166 | dev_err(&pdev->dev, "Fail to register CLK_PMIC\n"); |
| 167 | goto err_clk_pmic; |
| 168 | } |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | platform_set_drvdata(pdev, max77686_clks); |
| 173 | |
| 174 | goto out; |
| 175 | |
| 176 | err_clk_pmic: |
| 177 | clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup); |
| 178 | kfree(max77686_clks[MAX77686_CLK_CP]->hw.clk); |
| 179 | err_clk_cp: |
| 180 | clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup); |
| 181 | kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk); |
| 182 | err_clk_ap: |
| 183 | out: |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | static int max77686_clk_remove(struct platform_device *pdev) |
| 188 | { |
| 189 | struct max77686_clk **max77686_clks = platform_get_drvdata(pdev); |
| 190 | int i; |
| 191 | |
| 192 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { |
| 193 | clkdev_drop(max77686_clks[i]->lookup); |
| 194 | kfree(max77686_clks[i]->hw.clk); |
| 195 | } |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static const struct platform_device_id max77686_clk_id[] = { |
| 200 | { "max77686-clk", 0}, |
| 201 | { }, |
| 202 | }; |
| 203 | MODULE_DEVICE_TABLE(platform, max77686_clk_id); |
| 204 | |
| 205 | static struct platform_driver max77686_clk_driver = { |
| 206 | .driver = { |
| 207 | .name = "max77686-clk", |
| 208 | .owner = THIS_MODULE, |
| 209 | }, |
| 210 | .probe = max77686_clk_probe, |
| 211 | .remove = max77686_clk_remove, |
| 212 | .id_table = max77686_clk_id, |
| 213 | }; |
| 214 | |
| 215 | static int __init max77686_clk_init(void) |
| 216 | { |
| 217 | return platform_driver_register(&max77686_clk_driver); |
| 218 | } |
| 219 | subsys_initcall(max77686_clk_init); |
| 220 | |
| 221 | static void __init max77686_clk_cleanup(void) |
| 222 | { |
| 223 | platform_driver_unregister(&max77686_clk_driver); |
| 224 | } |
| 225 | module_exit(max77686_clk_cleanup); |
| 226 | |
| 227 | MODULE_DESCRIPTION("MAXIM 77686 Clock Driver"); |
| 228 | MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); |
| 229 | MODULE_LICENSE("GPL"); |
| 230 |
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